8 independent third-party assays of Tesamorelin, covering 4 vendors.
Measured purity across those assays runs from 99.0% to 99.6%, median 99.4%. The spread is the point: it is variation between lots and between vendors, not a single number that describes the compound.
Assay dates span 2025-01-22 to 2025-11-19.
Manufacturer recorded on the certificates: Eros Labs, HP RESEARCH.
Tesamorelin carries an evidence grade of A on this site (FDA Approved). Tesamorelin (tesamorelin acetate) is a synthetic 44-amino-acid analog of human growth hormone-releasing hormone (GHRH) and the only FDA-approved medication for reducing excess abdominal fat in HIV-infected adults with lipodystrophy,…
A certificate of analysis describes the lot that was submitted and nothing else. It is not a guarantee about a later batch, and purity is not identity — a sample can assay clean and still be the wrong compound, or the right compound at the wrong concentration. Vendors with no assay row below have not been tested here, which is not the same as having failed.
| Vendor | Assays | Median measured purity | Most recent |
|---|---|---|---|
| Reta-Peptide | 2 | 99.6% | 2025-11-19 |
| Eros Peptides | 4 | 99.4% | 2025-09-15 |
| HAPPYPEPTIDES.COM | 1 | 99.1% | 2025-01-22 |
| HPR | 1 | not reported | 2025-09-01 |
Compound profile: Tesamorelin — evidence, mechanism and safety.
Vendors assayed: Reta-Peptide, Eros Peptides, HAPPYPEPTIDES.COM, HPR.